Hum Modulation - ADInstruments S7200 Operation Manual

AD INSTRUMENTS

6.1.3. HUM Modulation

Hum modulation is a power source frequency interference. It creates a visible
distortion in the television picture. The S7200 measures hum modulation
interference for analog and digital channels. The analog measurement screen is
shown below.
The low frequency interference and interference harmonic will disrupt the analog
TV signal, the hightest measurable fourth harmonic of the S7200 are :
- 50Hz, 100Hz, 150Hz and 200Hz in 50Hz,
- 60Hz, 120Hz, 180Hz and 240Hz in 60Hz.
Figure 6-4 Snapshot: Analog TV Hum Measurement
Parameter Instruction
Channel
Frequency
Button Operations:
[50Hz]/[60Hz]
[Hold]
120
S7200 TV Signal Analyzer Operation Manual
select active channels in the active channel plan
Range: 5MHz-1200MHz;
press this button to toggle the power frequency to be
measured between 50Hz and 60Hz depending on your
region.
press this button to pause, and press again to continue